import java.util.*;
public class Example3_9 {
    public static void main(String []args){
      Scanner reader = new Scanner (System.in);
      double sum=0;
      int m=0;
      while(reader.hasNextDouble()){
        double x=reader.nextDouble();
        m=m+1;
        sum=sum+x;
      }
      System.out.printf("%d个数的和为%f\n",m,sum);
      System.out.printf("%d个数的平均值是%f\n",m,sum/m);
    }
}

